The constituents of Schizandra chinensis Baill. V. The structures of four new lignans, gomisin N, gomisin O, epigomisin O and gomisin E, and transformation of gomisin N to deangeloylgomisin B.

Four new dibenzocyclooctadiene lignans, gomisins N (1), O (2) and E (4), and epigomisin O (3), together with a known lignan (+)-deoxyschizandrin (5) were isolated from the fruits of Schizandra chinensis BAILL. (Schizandraceae). The structures of the new lignans were elucidated by chemical and spectral studies. The transformation of 1 to deangeloylgomisin B (debenzoylgomisin C) (6) is also described.